It's just that there are so many awful tales of nightmare tenants who don't pay the rent and can't be evicted, it seems to be a lottery as to whether you get a good tenant or an evil one - and you're going to get two lots of tenants so you'd have to strike it lucky twice. Plus, even if they are good tenants, once they're in they're there for the 3 year term of the lease, so you can forget about selling either of the houses for the next 3 years unless the tenants happen to want to buy it. The idea of it would stop me sleeping at night TBH but anyway all the regulations are here http://vosdroits.service-public.fr/particuliers/F2042.xhtml click on either unfurnished or furnished and it will tell you what the criteria are for a 'decent' property, plus all the other red tape. Bonne chance